Leopold Maximilian Graf von Firmian (11 October 1766, Trento – 29 November 1831, Vienna) was Auxiliary Bishop in Passau and Titular Bishop of Tiberias from 1797, from 1800 to 1816 Bishop of Lavant, was appointed Archbishop of Salzburg in 1816, but in 1818 was only confirmed as administrator of the Archdiocese of Salzburg.

Coming from the Tyrolean nobility of Firmian, he was canon of Salzburg and Passau in 1780.

The episcopal consecration was bestowed upon him on 5 November 1797 by the Bishop of Passau, Leopold Leonhard von Thun.

On 18 January 1822, Emperor Francis I appointed him Archbishop of Vienna, the Papal confirmation took place on 19 April of the same year.

During his tenure came the founding of the Leopoldine Society of the Austrian Empire in support of the American missions on 13 May 1829.